While those cars continue to make headlines, Geneva is also home to an eclectic collection of concept cars and production models which, by themselves, don't make the front page. Here's Autocar's pick of the weird and wonderful cars at the Geneva motor show.

The Biofore Concept aims to show how renewable materials could eventually take over from metals and plastics as the main materials for building cars. Built by students at the Metropolia University of Applied Sciences in Helsinki, the Biofore is made from biocomposite and thermoformable wood and runs on wood-friendly diesel.

Bugatti's 'Lang Lang' special-edition Veyron is inspired by the Chinese concert pianist of the same name. The special, which runs seperately to Bugatti's Legends series, gets new black and white bodywork, new alloy wheel designs as well as gold-plated badges.

The production version of Citroën's C4 Cactus will face off against the likes of the Volkswagen Golf when it goes on sale in the UK in October, priced from around £13,000. Citroën used the Geneva motor show to explore how customers could customise the Cactus, revealing the new C4 Cactus Adventure concept. The Adventure gets new off-road-inspired styling as well as a custom roof box.

One of the more extreme design concepts at the show was the Edag Genesis. Rather than showing a complete car, the Genesis is designed to demonstrate a new car-making process which could potentially save the industry vast sums of money. Styled to look like the shell of a tortoise, the Genesis is made by a new process known as additive manufacturing.

The Quant e-Sportlimousine shows a new advanced battery storage technology, which its makers say performs five times better than current lithium-ion batteries. The 5.35m-long concept is powered by four electric motors, with reports suggesting up to 912bhp is available in total, alongside a 0-62mph sprint time of 2.8 seconds and a top speed of 236mph.

Lamborghini already has plenty to talk about on its Geneva stand, thanks to the launch of the new Huracán. The Italian supercar builder also showed customers its extensive list of personalisation options, by revealing a heavily modified version of the Aventador.

Some of the cars on display we've seen before, like the BMW Gran Lusso Coupé concept. Revealed in Italy last year, the Gran Lusso aims to show how a new BMW 8-series might look. The four-seat coupé is based on the same platform as the BMW 7-series, with power supplied by a 6.0-litre turbocharged V12 engine with 537bhp.

Cadillac's Emiraj concept was unveiled in Pebble Beach last year, and shows how the brand's styling will evolve in the coming years. With a streamlined design and a rear-wheel-drive layout, the Emiraj gets a prototype chassis and structure plus a luxurious interior featuring titanium, wood and leather trim. Elsewhere, the concept gets 22-inch aluminium wheels with ceramic disc brakes and monoblock brake calipers.

The 24 Hours of Le Mans endurance race will take place in June, with new competitors joining the field including the Chevrolet Corvette C7.R. Powered by a 5.5-litre naturally aspirated V8 engine with just under 500bhp, the C7.R weighs in at 1245kg.